In 1934 he accepted an invitation to return to Japan for a fifteen-month tour of country potteries, looking at traditional work, making pots in country potteries and collecting material for a book. He also took the opportunity to travel with Yanagi to Korea, a country that filled him with enthusiasm. Despite Japanese occupation it remained largely unspoilt and many traditional crafts were still practised unselfconsciously by anonymous craftsmen. It was on this visit that Leach bought the famous Moon Jar, recently acquired by the British Museum and on show in the Korean Gallery.